Half marathons in Colorado — October 2026
9 upcoming half marathons in Colorado during October 2026.
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This calendar in numbers
This calendar currently lists 9 upcoming events, from Oct 3, 2026 to Oct 31, 2026. October is the busiest month, with 9 events scheduled. Events are spread across 8 different locations; Colorado Springs hosts the most (2). Course distances range from 15 km to 21.1 km.